.gallerycontainer{
position: relative;
/*Add a height attribute and set to largest image's height to prevent overlaying*/
}

.thumbnail img{
border: 1px solid #CCCCCC;
/*margin: 0 5px 5px 0;*/
}

.thumbnail:hover{
background-color: transparent;
}

.thumbnail:hover img{
border: 1px solid #CCCCCC;
}

.thumbnail span{ /*CSS for enlarged image*/
position: absolute;
/*left: -1000px;*/
border: 1px solid white;
visibility: hidden;
color: black;
text-decoration: none;
}

.thumbnail span img{ /*CSS for enlarged image*/
border-width: 0;
padding: 0px;
}

.thumbnail:hover span{ /*CSS for enlarged image*/
visibility: visible;
 /*position where enlarged image should offset horizontally */
z-index: 50;
}